[PATCH] Refactor classes in sample profiler for new functionality

[Diego Novillo]

Hi chandlerc,

I'm adding new functionality in the sample profiler. This will
require more data to be kept around for each function, so I moved
the structure SampleProfile that we keep for each function into
a separate class.

There are no functional changes in this patch. It simply provides
a new home where to place all the new data that I need to propagate
weights through edges.

There are some other name and minor edits throughout.

http://llvm-reviews.chandlerc.com/D2223

Files:
  lib/Transforms/Scalar/SampleProfile.cpp
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